[clang-tools-extra] [clang-tidy] Add an option to treat warnings as errors (PR #128221)

[Carlos Galvez via cfe-commits]

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@@ -97,6 +97,9 @@ Improvements to clang-tidy
   Note: this may lead to false negatives; downstream users may need to adjust
   their checks to preserve existing behavior.
 
+- Improved :program:`clang-tidy-diff.py` script. Add the `-warnings-as-errors`
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carlosgalvezp wrote:

Nit: "add the `-warnings-as-errors` _argument_ to treat warnings as errors.

https://github.com/llvm/llvm-project/pull/128221